pronephros


pronephros
1. The definitive excretory organ of primitive fishes. SYN: head kidney. 2. In the embryos of higher vertebrates, a vestigial structure consisting of a series of tortuous tubules emptying into the cloaca by way of the primary nephric duct; in the human embryo, the p. is a very rudimentary and temporary structure, followed by the mesonephros and still later by the metanephros. SYN: forekidney, primordial kidney. [pro- + G. nephros, kidney]

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pro·neph·ros (')prō-'nef-rəs, -.räs n, pl -neph·roi -.rȯi either member of the first and most anterior pair of the three paired vertebrate renal organs that functions in the adults of amphioxus and some lampreys, functions temporarily in larval fishes and amphibians, and is present but nonfunctional in embryos of reptiles, birds, and mammals compare MESONEPHROS, METANEPHROS

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n.
the first kidney tissue that develops in the embryo. It is not functional and soon disappears. Compare mesonephros, metanephros.

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pro·neph·ros (pro-nefґros) pl. pronephґroi [pro- + Gr. nephros kidney] 1. a vestigial excretory structure that develops in the human embryo at four weeks, before the mesonephros. Although nonfunctional, its duct is later used by the mesonephros, which arises caudal to it. 2. the definitive excretory organ of primitive fishes.

Medical dictionary. 2011.

Look at other dictionaries:

  • pronéphros — ● pronéphros nom masculin (grec nephros, rein) Rein embryonnaire pair des vertébrés, qui s édifie très tôt dans la région cardiaque, et aux dépens duquel se forment le canal de Wolff, ou uretère primaire, et le canal de Müller, ou oviducte.… …   Encyclopédie Universelle

  • Pronephros — Pro*neph ros, Pronephron Pro*neph ron, n. [ NL., fr. Gr. ? before + ? a kidney.] (Anat.) The head kidney. See under {Head}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Pronephros — (Kopf , Vorniere), s. Nieren …   Meyers Großes Konversations-Lexikon

  • Pronephros — Pronephros,   Anatomie: die Vorniere (Niere) …   Universal-Lexikon

  • Pronephros — ⇒ Vorniere …   Deutsch wörterbuch der biologie

  • pronephros — [prō nef′räs] n. [ModL < pro , PRO 1 + Gr nephros, kidney: see NEPHRO ] Zool. a primitive kidney, the most anterior of three pairs of renal organs, functional only during embryonic development in most lower vertebrates, and appearing only… …   English World dictionary

  • Pronephros — Infobox Embryology Name = PAGENAME Latin = GraySubject = 252 GrayPage = 1205 Caption = Caption2 = System = Days = 20 CarnegieStage = 10 Precursor = nephrotome GivesRiseTo = mesonephros MeshName = MeshNumber = DorlandsPre = p 36 DorlandsSuf =… …   Wikipedia

  • Pronéphros — Le pronéphros est un organe excréteur rudimentaire qui se développe chez tous les vertébrés. Sommaire 1 Fonction 2 Développement 3 Formation et disparition 4 Note historiq …   Wikipédia en Français

  • pronephros — pronephric /proh nef rik/, adj. /proh nef ros, reuhs/, n., pl. pronephroi / roy/, pronephra / reuh/. Embryol. one of the three embryonic excretory organs of vertebrates, which becomes the functional kidney of certain primitive fishes. Cf.… …   Universalium

  • Pronephros — proinkstis statusas T sritis gyvūnų raida, augimas, ontogenezė, embriologija atitikmenys: lot. Pronephros ryšiai: platesnis terminas – šlapimo organai siauresnis terminas – išoriniai kamuolėliai siauresnis terminas – proinksčio latakas siauresnis …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Pronephros — proinkstis statusas T sritis embriologija atitikmenys: lot. Pronephros ryšiai: platesnis terminas – inkstų sistema siauresnis terminas – proinksčio latakas siauresnis terminas – proinksčio vamzdeliai …   Medicininės histologijos ir embriologijos vardynas


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